package com.duangframework.encrypt.algorithm;

import com.duangframework.encrypt.exception.EncryptException;

import java.security.MessageDigest;
import java.util.Arrays;

/**
 * SHA1Algorithm class
 *
 * 计算消息签名接口.
 */
public class SHA1Algorithm {

	private static final String SHA1_ALG         = "SHA-1";

	public SHA1Algorithm() {

	}

	/**
	 * 用SHA1算法生成安全签名
	 * @param token 票据
	 * @param timestamp 时间戳
	 * @param nonce 随机字符串
	 * @param encrypt 密文
	 * @return 安全签名
	 * @throws EncryptException
	 */
	public static String getSHA1(String token, String timestamp, String nonce, String encrypt) throws EncryptException {
		try {
			String[] array = new String[] { token, timestamp, nonce, encrypt };
			StringBuffer sb = new StringBuffer();
			// 字符串排序
			Arrays.sort(array);
			for (int i = 0; i < 4; i++) {
				sb.append(array[i]);
			}
			String str = sb.toString();
			// SHA1签名生成
			MessageDigest md = MessageDigest.getInstance(SHA1_ALG);
			md.update(str.getBytes());
			byte[] digest = md.digest();

			StringBuffer hexstr = new StringBuffer();
			String shaHex = "";
			for (int i = 0; i < digest.length; i++) {
				shaHex = Integer.toHexString(digest[i] & 0xFF);
				if (shaHex.length() < 2) {
					hexstr.append(0);
				}
				hexstr.append(shaHex);
			}
			return hexstr.toString();
		} catch (Exception e) {
			throw new EncryptException(EncryptException.ComputeSignatureError);
		}
	}
}
